This tutorial describes how to plug the serial ttl usb port in you Asus
O'Play to your PC and access oplay through the serial console.

This
might come in handy if you "brick" your oplay or otherwise need console
access like when you replace Busybox with a new version that has a
different telnet daemon...

YOU MIGHT BREAK YOUR OPLAY IF YOU CONNECT THINGS WRONG. PROCEED AT YOUR OWN RISK!!!

You
can't just connect the 4 pins in your oplay motherboard to a PC USB
port. You need a Serial TTL USB kit or some USB data cable that already
has a transceiver. You can use Nokia CA-42 or DKU-5 data cable.

YUMI (Your Universal Multiboot Installer), is the successor to
MultibootISOs. It can be used to create a Multiboot USB Flash Drive
containing multiple operating systems, antivirus utilities, disc
cloning, diagnostic tools, and more. Contrary to MultiBootISO's which
used grub to boot ISO files directly from USB, YUMI uses syslinux to
boot extracted distributions stored on the USB device, and reverts to
using grub to Boot Multiple ISO files from USB, if necessary.

Aside from a few distributions, all files are stored within the
Multiboot folder, making for a nicely organized Multiboot Drive that can
still be used for other storage purposes.